Exfoliation of self-assembled 2D organic-inorganic perovskite semiconductors

Niu, Wendy; Eiden, Anna; Prakash, G. Vijaya; Baumberg, Jeremy J.

doi:10.1063/1.4874846

Cited by 138 publications

(124 citation statements)

References 33 publications

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“…In this context,, the possibility of produc-ing ultrathin OIPC sheets via mechanical exfoliation was recently reported. 27 Here, we demonstrate the formation of ultrathin crystalline layers of (C 4 H 9 NH 3 ) 2 PbI 4 OIPCs by mechanical exfoliation. These exfoliated nanosheets (NS) are produced by the same mechanical exfoliation technique as has been successfully applied to other van-der-Waals materials, such as transition metal dichalcogenides and graphene.…”

Section: -7mentioning

confidence: 99%

Excitons in ultrathin organic-inorganic perovskite crystals

et al. 2015

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We demonstrate the formation of large sheets of layered organic-inorganic perovskite (OIPC) crystals, as thin as a single unit cell, prepared by mechanical exfoliation. The resulting 2D OIPC nano sheets of 2.4 nm thickness are direct semiconductors with an optical band gap of 2.4 eV. They exhibit unusually strong light-matter interaction with an optical absorption as high as 25% at the main excitonic resonance, as well as bright photoluminescence. We extract an exciton binding energy of 490 meV from measurement of the series of excited exciton states. The properties of the excitons are shown to be strongly influenced by the changes in the dielectric surroundings. The environmental sensitivity of these ultrathin OIPC sheets is further reflected in the strong suppression of a thermally driven phase transition present in the bulk crystals.

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Section: -7mentioning

confidence: 99%

Excitons in ultrathin organic-inorganic perovskite crystals

et al. 2015

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“…Several approaches, including mechanical exfoliation [87,88], chemical vapor deposition [89], solutionprocessing [8,90,91], and colloidal methods [92] have been developed to prepare 2D perovskites. As compared to mechanical exfoliation and chemical vapor deposition techniques, solution-processing approach was more effective to achieve high-quality crystals [93].…”

Section: D and Quasi-2d Metal Halide Hybridsmentioning

confidence: 99%

Organic–inorganic metal halide hybrids beyond perovskites

Zhou

Lin

Lee

et al. 2018

Materials Research Letters

104

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Organic-inorganic metal halide hybrids have emerged as new generation functional materials with exceptional structure and property tunability for a variety of applications. Besides the most investigated ABX 3 metal halide perovskites, a variety of hybrids consisting of a wide range of organic cations and metal halide anions have been developed and studied recently. Here, we provide an overview of these new materials possessing various crystallographic structures, including double perovskites, low dimensional hybrids, and other perovskite-related materials. We discuss their syntheses, functional properties, and optoelectronic applications. Challenges and opportunities are then laid out for these hybrid materials beyond perovskites. IMPACT STATEMENTBy choosing appropriate organic cations and metal halide anions, single crystalline ionically bonded hybrid materials can be assembled to possess various structures beyond the well-known ABX 3 perovskite. These hybrid materials exhibit exciting new properties with potential applications in a variety of areas. ARTICLE HISTORY

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“…To investigate the occurrence of two-dimensionally conned properties, ultra-thin CH 3 NH 3 PbX 3 perovskite single-crystal akes have been prepared through mechanical exfoliation, 18 chemical vapour deposition (CVD) 19,20 and solution selfassembly. 21 The high crystal quality and symmetrical geometries of CH 3 NH 3 PbX 3 perovskites result in high quality factors (Q), which can result in random lasing in whispering gallery mode.…”

Section: -17mentioning

confidence: 99%

Bose–Einstein oscillators and the excitation mechanism of free excitons in 2D layered organic–inorganic perovskites

Peng

et al. 2017

RSC Adv.

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Following intense research on two-dimensional (2D) materials, there has been a resurgence of interest in 2D layered hybrid organic-inorganic perovskites. These 2D perovskites have direct band gaps regardless of their thickness. Excitons are confined to monolayers because of the materials' selforganized quantum-well electronic structure. Gaining insight into the exciton dynamics is central to understanding the light-matter interactions in 2D organic-inorganic perovskites. Herein, we investigate the free-exciton dynamics in 2D layered CH 3 (CH 2 ) 3 NH 3 PbI 4 perovskite, demonstrating an anomalous temperature variation of the photoluminescence (PL) energy, which deviates from the conventional Varshni formula and is consistent with the behaviour of Bose-Einstein oscillators. The acoustic phonons induced by the coherent lattice motion of the atoms result in a positive temperature variation. Two-pulse emission modulation measurements reveal the excitation mechanism of the strong two-photon PL in CH 3 (CH 2 ) 3 NH 3 PbI 4 perovskite, in which two photons are simultaneously absorbed through a virtual state.

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Exfoliation of self-assembled 2D organic-inorganic perovskite semiconductors

Cited by 138 publications

References 33 publications

Excitons in ultrathin organic-inorganic perovskite crystals

Excitons in ultrathin organic-inorganic perovskite crystals

Organic–inorganic metal halide hybrids beyond perovskites

Bose–Einstein oscillators and the excitation mechanism of free excitons in 2D layered organic–inorganic perovskites

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